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White rectangular wall thermostat with touchscreen display and built-in IAQ sensor

Venstar

Venstar Explorer T4950 4H/2C smart thermostat with IAQ sensor

SKU CH-QNT3-S8N0H

Commercial thermostat handles four heat and two cool stages while its built-in IAQ sensor activates a 24 V blower when air quality drops

  • ProtocolWiFi
  • IAQ sensor triggers 24V output and blower when air quality drops
  • 4-stage heat and 2-stage cool with auto changeover for gas, electric or heat pump
  • 7-day or non-programmable scheduling with 365-day holiday programming via Skyport
  • Works with Google Assistant and Amazon Alexa for voice control and FDD alerts
  • Compatible with VenNet wireless sensors for outdoor temperature and humidity monitoring

Venstar Explorer T4950 thermostat

The Venstar Explorer T4950 is a commercial smart thermostat designed for HVAC systems requiring up to four stages of heating and two stages of cooling. It suits building managers and technicians who need programmable or non-programmable control with integrated air quality monitoring. The device supports gas/electric and heat pump configurations with automatic changeover between modes.

IAQ sensor and stage control

A built-in indoor air quality sensor activates a 24V output and the system blower when air quality drops to a preset threshold. The thermostat handles humidification, dehumidification and reheat functions with adjustable timers and dead bands between stages. Outdoor sensor readiness adds flexibility for advanced climate strategies.

WiFi protocol and Skyport integration

The unit communicates via WiFi and connects to the Skyport platform for 365 day holiday programming and remote management. It works with Google Assistant and Amazon Alexa for voice control and delivers fault detection and diagnostics notifications. VenNet wireless sensor pairing simplifies installation in larger commercial spaces.

Highlights

  • IAQ sensor triggers 24V output and blower when air quality drops
  • 4-stage heat and 2-stage cool with auto changeover for gas, electric or heat pump
  • 7-day or non-programmable scheduling with 365-day holiday programming via Skyport
  • Works with Google Assistant and Amazon Alexa for voice control and FDD alerts
  • Compatible with VenNet wireless sensors for outdoor temperature and humidity monitoring

Specifications

ProtocolWiFi

Questions about this item

Will the 4H/2C staging work with my existing gas furnace and heat-pump setup?

The thermostat supports up to four stages of heating and two stages of cooling, so it can control a gas/electric or heat-pump system with multi-stage equipment.

How do I confirm the IAQ sensor is triggering the blower correctly after installation?

When indoor air quality drops to the preset threshold, the built-in sensor activates a 24V output that turns on the blower; you can verify operation by watching the blower run in response to a deliberate air-quality change.

Does the package include the outdoor sensor and VenNet wireless sensors, or must I buy them separately?

The unit is outdoor-sensor ready and compatible with VenNet wireless sensors, but those sensors are not included and must be purchased separately.

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